Docker container security scanning is used to detect security vulnerabilities in images. Common tools: 1) Docker Scout (Docker official tool, integrated into Docker CLI); 2) Trivy (open source, supports multiple formats); 3) Clair (open source, can build self-hosted scanning service); 4) Anchore (enterprise-grade, supports policy management); 5) Snyk (commercial service, integrates with CI/CD). Scanning content: OS vulnerabilities, application dependency vulnerabilities, configuration issues, sensitive information leaks. Best practices: integrate security scanning in CI/CD workflows, regularly scan deployed images, promptly fix discovered high-risk vulnerabilities, use official or trusted base images.